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vow y LEach of the nine large pits should have an inspection pipe accessible from grade to measure effluent levels in the pits with a water level meter. These measurements will assess the operation of the pits and the potential need to divert effluent to the smaller pits. The number of septic tanks servicing the Bingo Parlor should be three -two thousand gallon tanks and one -twelve hundred gallon tank, all in series. The total storage volume of the nine large seepage pits and 50 (max) smaller pits which will be servicing the Bingo Parlor is calculated to be: Porosity of the washed drain rock was tested and calculated at 40%. 451 ft' X 7.5 X 9 pits + 145 ft' X 7.5 X 50 pits X .40= 33,927 gals IY. GROUNDWATER DATA The domestic well at 3730 N. Wilson Way (Brannon Tire) has indicated an increase in nitrate concentration from last year's analysis. One year ago, nitrate levels were measured at I 1 ppm as NO3. On July 22, 1994 nitrate was measured at 24 ppm as NO3. Last year's chloride level was 30 ppm, however, interestingly enough this year's measurement has decreased to 18 ppm chloride. It is well documented in the scientific literature that sewage contamination adds chloride to the groundwater. The concentrations of chlorides in septic tanks, and thereby effluent discharge have been reported to range from 37 to 101 mg/1 (ppm). Chloride travels exceptionally well in saturated soil environments, even more so than the nitrate molecule. Therefore, increase chloride content in the groundwater is usually the first indication of contamination. High nitrate together with high chloride is a more positive indication of sewage contamination than is nitrate alone. Possible explanations for this nitrate increase may be due to upgradient agricultural practices or on-site contamination from Brannon Tire. Various researchers have suggested that nitrate moves in a "pulse" fashion by which the introduction on nitrate from whatever source travels so readily in the saturated environment, that the molecules follow the hydraulic front. This recent water analysis may be an illustration of the pulse theory. Only monitoring of this well on a periodic basis for an extended length�of time can adequately assess potential impact. 6 Vafley Ag Pffearck